Drive for shoe-sewing machines



F. E. VALOIS. om-vs FOR SHOE siwme MACHINES.

APPLICATION FILED AUG- I. 19:8.

1,368,417. Patented Feb. 15, 1921.

2 SHEETSSH'EET 1- l L i k 1 F. E. VALOIS.

- DRIVE FOR SHOE SEWING MACHINES.

APPLICATION HLED AUG. 1, 1918- 1,368,417.

Patented Feb. 15,1272L 2 SHEETS SHEET I INVENTUVI h 6-24 Z Van;

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UNITED stares PATENT @LFEICE.

FELIX EMILE VALOIS, OF HAVEEHILL, MASSACHUSETTS, ASSIGNOR TO HAMEL SHOE MACHINERY COIEPANY, OF LYNN, IVLASSAGHUSETTS, A CORPORATION OF MASSA- CH'USETTS.

DRIVE FOR SHOE-SERVING MACHINES.

Patented Feb. 15, 1921.

Application filed August 1, 1918. Serial No. 247,753.

To all whom it may concern:

Be it known that I, FELIX Ewen Vilnius, a citizen of the United States, residing at Haverhill, county of Essex, State of Massachusetts, have invented a certain new and useful Improvement in Drives for Shoe- Sewing Machines, of which the following is a specification, reference being had therein to the accompanying drawings.

- The invention relates to a new and improved sewing machine and particularly to the driving mechanism for the various stitch forming and working instrumentalities which perform the several operations 011 the material to be sewn and on the thread from which the stitches are formed. The sewing machine embodying my invention is particularly intended for use in stitching the outsole to the welt in the manufacture of boots and shoes and to that end is provided with stitch forming and working instrumentalities some of which are as follows: Curved hook needle, looper, shuttle, awl, four-motion awl feed, needle guide, thread finger, take up, thread lock, thread measuring mechanism, thread lifter and presser foot lock. The machine embodying my invention is intended, to be operated at extremely high speed, and, therefore, it is necessary to reduce to a minimum the jar and vibration produced by the moving parts.

In the accompanying drawings, there are shown a number of inventions relating to various parts of the machine which inventions are not claimed in the present application as they are believed to be separate and independent inventions and therefore have been made the subject matter of separate applications filed co-incidently herewith.

To produce the most effective cooperation of the various stitch forming and working instrumentalities, it is desirable that certain of the instrumenta-lities have varying angular velocities compared with the uniform angular velocity of the main shaft and it is necessary that the several working instrumentalities be given their proper movements in time with each other. In the past these results have been accomplished imperfectly by using plate and edge cams of large diameter or racks and pinions to operate the several instrinnentalities but these mechanisms produce a great amount of noise and vibration, owing to the steep places in the cams, to the long heavy or springy cam followers, and to the rapidity with which the various parts become loose from wear.

To increase the speed of the machine and to produce one which will run much more smoothly than a cam and rack operated machine of the ordinary type, I have devised a novel driving mechanism including a main shaft, a differential shaft and a rocker shaft. The differential shaft makes one revolution for each revolution of the main shaft, but the angular velocity of the differential shaft varies during different portions of its rotation while the angular velocity of the main shaft is constant. The rocker shaft oscillates instead of rotating and is actuated by connections from the main shaft these connections being so devised as to produce,

variations in angular velocity of the rocker shaft relatively to the main shaft. In the form of my machine shown in the drawings, the needle, shuttle, and looper are actuated by the main shaft; the awl feed, and presser foot lOCK are actuated by the differential shaft and the other working instrumentalities are actuated by the rocker-shaft. This general arrangement makes it possible to do away with all but one edge or face cam, the necessary movements being produced by the use of cranks, eccentrics and small rocker cams which have only small angular movement.

This arrangement produces a machine which runs smoothly even at very high speed.

While as described, the needle, shuttle and looper are shown to be operated by the main shaft, the awl feed by the differential shaft and other working instrumentalities by the rocker shaft, it is not intended to limit this patent to this arrangement as under certain conditions it may be desirable to have cer tain of the working instrumentalities operated by one of the shafts other than that by which it is operated in the machine shown in the drawings of this application. A stop motion which acts by disconnecting the driving mechanism from the main shaft is also shown in part but this forms no part of the present invention.

The invention will be fully understood from the following description when taken in connection with the accompanying draw ings and the novel features thereof will be pointed out and clearly defined in the claims at the closeof this specification.

1n the drawings Figure l is a top plan ofthe portion of a sewing machine embodying my invention, some of the parts being shown in section and others being broken away for convenience of illustration.

Fig. 2 is an end view partly in section of the parts shown in Fig. 1.

Referring now to the drawings, the frame of the machine is shown at A. At 11 is shown the main shaft, at 12 the differential shaft and at 18 the rocker shaft. The axes of differential shaft 12 and of the main shaft 11 are nearly but not exactly in line with each other and are supported in suitable bearings in the frame of the machine. The main shaft 11 is provided with a hand wheel 14.

The driving connections by means of which the differential shaft and rocker shaft are operated by the main shaft are located between the proximate ends of the main shaft 11 and the differential shaft 12.

On the end of the main shaft, is located a crank 15 provided with a crank pin 16 which actuates the needle drive by means of a connecting rod 10. The needle drive need not be described in detail here. On the end of the crank pin 16, is located a second crank 17 having thereon a crank pin 18. The crank 17 and pin 18 although secured to the crank pin 16 are in effect a simple crank and pin on the end of the main shaft nearest the differential shaft. On the end of the differential shaft which is toward the main shaft is a crank 19 having a crank pin 21 which as will be hereinafter described operates in part the awl feed, and the rocker shaft. On the crank pin 21 is a second crank pin which enters a hole in a disk 20 which is free to rotate thereon. The disk 20 is also provided with a hole within which is received the crank pin 18 on the end of the main shaft 11. The cranks 17 and 19 on the proximate ends of the main and differential shafts together with the disk 20 constitute a differential driving mechanism for the dif ferential shaft and" the rocker shaft. The main shaft 11, being the driving shaft and having a uniform angular velocity, the differential shaft will be driven by it at varying angular velocities but will make one rotation for each rotation of the main shaft.

the differential shaft, the angular velocity will be greater than that of the main shaft while during other portions its angular velocity will be much less.

Surrounding the disk 20 is an eccentric strap 22 having an eccentric rod 23, the other end of which is pivotally connected to an arm 24 secured to the rocker shaft 13. The movement of the disk 20 in the eccentric strap 22 thus produces variations in the angular velocity of the rocker shaft 13, relatively to the main shaft 11, and also produces a very easy movement of the parts. The rocker shaft is provided with rocker cams 26, 27, 2S. and 30 by which some of the several stitch forming and working instrumentalities are operated. 1n the drawing five of these cams are shown but their number may be increased or diminished ac cording to the number'of instrumentalities to be operated from the rocker shaft. Each of the cams cooperates with a cam fork 33 and the cam the fork on both sides so that there is a positive actuation of the particular instrumentality in both direc tions without the use of springs. The rocker shaft is moved through a relatively small angle and therefore the movements of the instrumentalities moved thereby are easy and the mechanism quiet.

The needie is actuated by a connecting rod 10. one end of which surrounds the c ank pin 16 on the end of the main shaft 11 and the other end of which is connected to a link e11 pivoted at 4:2 to the needle sector 43.

The connecting rod 40. is pivotally attached at 1 1- to a link 45 the other end of which is secured at 16 to the frame of the machine. At 17 on the main shaft 11 is shown a master bevel gear meshing with two bevel gears 18 and 19 which together actuate the looper through mechanism which is not necessary to describe in detail in this speci: fication. One of these bevel gears 49 is ountcd on a shaft 50 which carries a spiral gear 51 which meshes with a gear 52 ch actuates the shuttle shaft 53 and the n -ttle 54-.

The awl is shown at and is mounted on an aw]. sector 56 pivoted on a shaft 57 which is in line with the shaft 58 on which the needle sector oscillates. The awl sector is oscillated by the crank 19 acting through the connecting rod 60 and universal joint 61. Between the crank 19 and the ring of the connecting rod 60 is placed a self-alining ball bearing 62 which permits the end of the connecting rod 60 to be moved out of its normal plane, that is toward and from the needle, during the feeding movement without cramping the parts. The forward and backward feeding movement is given to the awl by means of a cam 63 acting on a cam lever 6 1 pivoted at 65 to the frame of the machine. The end of the cam lever 64 which is away from the cam 63 is slotted as shown at 66 to receive a movable block 67 secured to a lever 68 having a handle 69 and pivot ally connected at 70 to the slide 71 on which the awl sector 56 is mounted.

The cam 63 and crank 19 together give it ment by links 96 and 97 pivoted together at 98 and actuated by a link 99 connected to the cam fork 33 operated by the rocker cam 27-on the rocker shaft 18.

What I claim is:

1. In a sewing. machine, stitch forming and working instrumentalities including a needle and a looper, a main shaft, and a differential shaft, the needle and looper being operated by the main shaft and others of said instrumentalities being operated by the differential shaft.

2. In a sewing machine, a needle, a looper and an awl feed, a main shaft, and a differential shaft, the needle and the looper being driven by the main shaft, and the awl feed by the differential shaft.

3. In a sewing machine, stitch forming and working instrumentalities including a needle, a looper, and a four-motion awl feed, a main shaft, a differential shaft, means for driving the differential shaft from the main shaft at differing angular velocities as compared with the main shaft, said needle and looper being operated by the main shaft, and mechanisms operated by the differential shaft for moving the awl in two directions at right angles to each other to produce the four motion feed.

4. In a sewing machine, stitch forming and working instrumentalities, a main shaft, a rotary differential shaft, and a rocker shaft, certain of said instrumentalities being operated by the main shaft, others by the differential shaft, and others by the rocker shaft.

5. In a sewing machine, stitch forming and working instrumentalities including a needle, a looper and an awl, a main shaft, a differential shaft and a rocker shaft, the needle and the looper being operated by the main shaft, the awl by the differential shaft, and the other instrumentalities by the rocker shaft.

6. In a sewing machine, stitch forming and working instrumentalities, including a needle, a looper, and an awl, a main shaft, a differential shaft and a rocker shaft, means for driving both the differential and rocker shafts at differing angular velocities as compared with the main shaft, the needle and looper being operated by the main shaft, the awl being driven by the differential shaft, and other working instrumentalities being driven by the rocker shaft.

7. In a sewing machine, stitch forming and working instrumentalities, a main shaft, a differential shaft, and means for driving said differential shaft from said main shaft, certain of said instrumentalities being actuated by said means.

8. In "a sewing machine, stitch forming and working instrumentalities, a main shaft, a differential shaft, andmeans to drive said differential shaft from said main shaft, certain of said instrumentalitics being actuated by said main shaft. certain actuated by said differential shaft, and certain actuated by said means.

9. In a sewing machine, stitch forming and working instrumentalities, a main shaft, a differential shaft, a rocker shaft, and means to drive said differential shaft from said main shaft. and connectionsto actuate said rocker shaft from said means, certain of said instrumentalities being actuated by said main shaft, certain actuated by said differential shaft, and certain actuated by said rocker shaft.

10. In a sewing machine, stitch forming and working instrumentalities including a take-up, a main shaft, a rocker shaft, and means for oscillating said rocker shaft, certain of said instrumentalities being actuated by said main shaft, certain actuated by said rocker shaft and said take-up actuated by both of said shafts.

11. In a sewing machine, stitch forming and working instrumentalities, a main shaft, a differential shaft, means for driving said differential shaft from said main shaft, and a rocker shaft actuated by said means, certain of said instrumentalities being actuated by said main shaft, certain actuated by said differential shaft, and certain actuated by said rocker shaft.

12. In a sewing machine, stitch forming and working instrumentalities, a main shaft, a difierential shaft. means for driving said differential shaft from said main shaft, and a rocker shaft, certain of said instrumentalities being actuated by said main shaft, certain actuated by said differential shaft, certain actuated. by said rocker shaft, and certain actuated by the combined action of certain of said shafts.

13. In a sewing machine, stitch forming and working instrumentalities, a main shaft, a differential shaft, means for driving said differential shaft from said main shaft, and a rocker shaft, certain of said instrumentalities being actuated by said main shaft, certain actuated by said differential shaft, certain actuated by said rocker shaft, and certain actuated by both said main shaft and said rocker shaft.

14. In a sewing machine, stitch forming and working instrumentalities including a needle, a four-motion awl,a looper, and a take-up, a main shaft, a differential shaft,

means todrive said differential shaft from said main shaft, and a rocker shaft, sald needle and looper being actuated by said main shaft, said take-up being actuated by saidmain shaft and said rocker-shaft, and said'aWl being actuated to pierce, feed and retract from the Work by said differential shaft. 7

15. In a sewing machine, stitch forming and Working instrumentalities including a needle, a looper and an and, a main shaft, a differential shaft, means for driving said differential shaft from said main shaft at difiering angular velocities as compared with said main shaft, means actuated by said differential shaft for imparting movement to the aWl, a rocker shaft driven by the means and arranged to actuate certain of said instrumentalities, and means for driving the needle and looper from certain of said shafts.

16. In a sewing machine, stitch forming and Working instrumentalities, a main shaft, a differential shaft, means for driving said differential shaft from said main shaft, and a rocker shaft actuated by said means, certain of said instrumentalities being actuated by said main shaft, certain actuated by said differential shaft, certain actuated by said rocker shaft, and certain actuated by the 30 combined action of certain of said shafts.

In testimony whereof I affix my signature.

FELIX EMILE VALOIS. 

